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Inquiries regarding instruments (sensors, DASes) or required hardware.

Convert Amplitude Scale in Geospace Y-28-3D

Your Question: 
Dear Sir, I am a student in Institute of Technology Bandung (ITB), I am on doing my final project about microseismic, on this good opportunity, I want to ask about how to convert amplitude scale in Geospace Y-28-3D instrument. in the seismogram, amplitude scale is in count, how to convert into milimeter. Thank you for your response. regards, Dias Arief Prasetyono Institute of Technology Bandung (ITB)
Asker Email: 
diasprasetyono@gmail.com
Category: 
Instrumentation

Convertion count to m/sec

Your Question: 
Dear IRIS Pascal Instrument Center, My name is Akhmad Fanani Akbar, I am from Institut Teknologi Bandung. I will do my thesis with focal mechanism topic. And I need some information with Geospace Y-28 (GS11-3D) High Frequency Sensor. Did IRIS Pascal Instrument Center have information about A0 and ratio count --> m/sec about this instrument? Because I couldn't found it in http://www.geospace.com/ and when I try to contact geospace by email, they never reply my email. I hope you can help me to solve my problem. Thank you, Best regard, Akhmad Fanani Akbar Geophysical Engineering Institut Teknologi Bandung
Asker Email: 
fanani_akbar@yahoo.co.uk
Category: 
Instrumentation

Hello Akhmad.  These two pages may help you.

The first is our Sensor Comparison Chart:

http://www.passcal.nmt.edu/content/instrumentation/sensors/sensor-comparison-chart

Here is the information from that page on the Y-28 Sensor:

  • Sensor : Y-28-3D
  • Manufacturer : Oyo-Geospace
  • Power : passive
  • Corner Frequency : 4.5 Hz
  • Damping : 0.707 critical
  • Sensitivity : 32 v/m/s
  • Poles and Zeroes :  2 poles, 2 zeros

A second page, "Working with Responses to Get Units of Ground Motion", explains how to get the units of ground motion:

What is a positive voltage for L4 and L22 Vertical, North, and East Components?

Your Question: 
We seem to see opposite polarities on L4 and L22 seismometers. What are the polarities supposed to be for the various seismometer types?
Category: 
Instrumentation
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